典型文献
Ringing cancellation in Carr-Purcell-Meiboom-Gill-type sequences
文献摘要：
We propose a four-step phase cycling scheme that can cancel ringings from both the excitation and the refocusing pulses in Carr-Purcell-Meiboom-Gill(CPMG)measurements.It allows accurate measurements of the first echo with short echo spacing tE,yielding improved precision of porosity,permeability,and fluid type identification in porous media study,at a cost of～25％signal reduction.In our example,we achieved tE=100 μs on a 6.8 MHz unilateral NMR sensor without using a Q-switch.These methods can be inte-grated in all nuclear magnetic resonance(NMR)protocols using CPMG,such as relaxation(T1,T2)and diffusion measurements,and do not require additional hardware(e.g.,Q-switches)to cancel ringing(although it can be used with a Q-switch to further reduce residual ringing).
文献关键词：
中图分类号：
作者姓名：
Shin Utsuzawa;Marcus Donaldson;Yi-Qiao Song
作者机构：
Schlumberger-Doll Research,Cambridge,MA,02139,USA;John A.Paulson School of Engineering and Applied Sciences,Harvard University,Cambridge,MA,02138,USA;Athinoula A.Martinos Center for Biomedical Imaging,Department of Radiology,Massachusetts General Hospital,Charlestown,MA,02129,USA
文献出处：
引用格式：
[1]Shin Utsuzawa;Marcus Donaldson;Yi-Qiao Song-.Ringing cancellation in Carr-Purcell-Meiboom-Gill-type sequences)[J].磁共振快报（英文）,2022(04):233-242
A类：
Ringing,ringings,CPMG
B类：
cancellation,Carr,Purcell,Meiboom,Gill,type,sequences,We,propose,four,step,phase,cycling,scheme,that,from,both,excitation,refocusing,pulses,measurements,It,allows,accurate,first,echo,short,spacing,tE,yielding,improved,precision,porosity,permeability,fluid,identification,porous,media,study,cost,signal,reduction,In,example,we,achieved,MHz,unilateral,NMR,sensor,without,These,methods,be,inte,grated,nuclear,magnetic,resonance,protocols,such,relaxation,diffusion,do,not,require,additional,hardware,switches,although,used,further,reduce,residual
AB值：
0.607533
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